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采用光学显微镜(OM)、扫描电镜(SEM),研究了固溶处理对流变压铸AM60镁合金组织及硬度的影响。结果表明,流变压铸成形的AM60镁合金在430℃固溶处理24 h后,AM60镁合金晶界及枝晶间的粗大网状β-Mg17Al12相几乎全部消除,只剩少量、不连续状的β-Mg17Al12相残留在晶界,α-Mg基体中出现少量细小颗粒状β-Mg17Al12相,α-Mg基体中的Al含量显著增加。而且,随着固溶时间的延长,流变压铸成形AM60镁合金组织中的初生颗粒与二次凝固区颗粒出现合并长大现象,它们的长大速率都随固溶时间的延长而降低,随固溶温度的升高而增大。
The effects of solution treatment on the microstructure and hardness of rheo-diecasting AM60 magnesium alloy were studied by optical microscope (OM) and scanning electron microscope (SEM). The results show that the rheological die-casting of AM60 magnesium alloy after 430 ℃ solution treatment 24 h, AM60 magnesium alloy grain boundaries and dendrites between the coarse network β-Mg17Al12 phase almost completely eliminated, leaving only a small amount of discontinuous β-Mg17Al12 phase remains in the grain boundary, a small amount of fine granular β-Mg17Al12 phase appears in the α-Mg matrix, and the content of Al in α-Mg matrix increases significantly. Moreover, as the solution time prolongs, the grains of the primary particles and the secondary solidification grains in the AM60 magnesium alloy prepared by rheo-diecasting appear to grow together. The growth rate of them all decreases with the increase of the solution time. Increasing the solution temperature.